Hi. I've just joined the AASVO, I heard about it from Variable Star South. On VSS they mentioned a campaign (see below) to monitor T Pyx for possible HST observations. I got some data and ran it through Astrometrica to get the magnitude - I'm unsure if this astrometry software is suitable for variable stars, if not, what is a good one?

I used a 35cm f10 Meade ACF SCT + SBIG STL11000M CCD. I took 60s expoures with a Clear filter at 2x2 binning. Sets of 5 images were stacked to get each image (observation line below) to run through Astrometrica.

The HST COS observations have been scheduled to take place during the window of 2018 October 4 - 6. It is essential to know the status of T Pyx in order for the HST team to safeguard the instrumentation and make a final decision about approving the COS observations.

Beginning immediately, please observe T Pyx in V one to two times per night; V is preferred to other filters or unfiltered. Visual observations are welcome. It is particularly important to have positive observations available to the HST team from the nights of October 2/3, 3/4, 4/5, 5/6, and 6/7; they will make their decision 24 hours before the scheduled observation time. Please continue nightly V snapshots until October 15.

Please submit observations as soon after making them as possible to the AAVSO International Database. If T Pyx appears to be going into outburst, report observations immediately and email AAVSO (aavso@aavso.org). T Pyx is around magnitude 15.5 V at minimum, and can brighten to magnitude 6 in outburst. Observations brighter than 14.0-14.5 should be treated as a possible outburst beginning.